event_buffer.h

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#ifndef EVENT_BUFFER_H
#define EVENT_BUFFER_H

#include <linux/types.h>
#include <linux/mutex.h>

int alloc_event_buffer(void);

void free_event_buffer(void);

void add_event_entry(unsigned long data);

/* wake up the process sleeping on the event file */
void wake_up_buffer_waiter(void);

#define INVALID_COOKIE ~0UL
#define NO_COOKIE 0UL

extern const struct file_operations event_buffer_fops;

/* mutex between sync_cpu_buffers() and the
 * file reading code.
 */
extern struct mutex buffer_mutex;

#endif /* EVENT_BUFFER_H */